I just got a used shell mill mounted on a R8 arbor. The cutter is made by Morse, is 1-1/8 inches in diameter, and has ten spiral teeth. It has no trouble whatsoever with aluminum. I was taking nearly full-width passes, 0.015" or so deep. Didn't even slow down while I squared up a block.
Steel will be another matter.
Typo. It's 2-1/8 inch in diameter.
I used to run a 3" 4fl indexable facemill at 0.150" DOC, full diameter, max spindle RPM in aluminum. Feed too hard and you can hear the machine bog. 0.015" should be trivial for any full-size knee mill.
Regards,
Robin
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